Optoelectronic imaging equipment is easy to expose to active laser detection devices because of"cat eye"effect.In this paper,we propose a new structure of optical system to reduce the retroreflector effect of a cat eye target.Decentered field lens structure is adopted in the design without sacrificing imaging quality and clear aperture.An imaging system with ±30° field of view is taken for example.The detailed design and simulation results are presented.The results indicate that this kind of optical system can reduce the retroreflection signal substantially and maintain acceptable imaging performance.